For each of the sets of samples in the accompanying figures (a)–(e), state which approach is best if the goal is to test the difference between the means of group 1 (on the left) and group 2 (on the right). Pay careful These graphs have not been drawn according to the best practices that we outlined in Chapter 2 (histograms of two samples should be displayed one above the other and on the same scale), but they are similar to those you might obtain if you plotted them separately with a computer program. Attention to differences between samples in the scales of the x-axis.

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(a) 12 (c) Frequency Frequency (b) 30 Frequency Frequency ܘ ܗ ܤ ܩ ܣ ܘ Frequency 8- 0 (d) 12 25- 20- 15- 10- 5- 0 8- 10- 8- 0 (e) 14- 12 10- 8- 6- 4- Group 1 6 8 10 12 14 16 18 0- 2.27 2.28 2.29 2.30 2.31 2.32 5 10 15 20 25 30 4- 2 0- 92 94 96 98 100 102 104 106 108 0- 94 96 98 100 102 104 106 108 Measurement 12- 10- 8 6- 4- 2 25- 20- 15- 10- 5- 0- 257 20- 0 12 14 16 18 20 22 24 26 28 14 12 10 0 8- 16 14 12 10 Group 2 15- 10- 5- 0- 0 200 400 600 800 1000 1200 20 40 60 L 6- 4- 2 0 92 94 96 98 100 102 104 106 40 60 80 80 100 120 140 160 Measurement